One more thought! I hear what you're saying, David, and agree on the quite different "looks." I haven't tried the breacan feile with a modern ensemble as some of the others have. If I was to try it, I'd incorporate some modifications, in much the same way as our present-day BPs and Kingussies have been modified. I'd have the pleats stitched into place and pressed, to give a neat appearance. I'd want an internal strap-and-buckle installed, and belt-loops to hold everything in position (and to make it easier to put the thing on!). In other words, it would be a somewhat different animal than the 5 yards of tartan I belt into place for a reenactment! And a short-waisted jacket or doublet would be a must, of course.
Hell; now I'll be spending more money...!